The effect of anion–ligand π-stacking interaction on silver(I) extraction by thiaoxa-macrocycles: A search for the evidences by X-ray and NMR approaches - Song, Mi Ryoung; Lee, Ji-Eun; Lee, So Young; Seo, Joobeom; Park, Ki-Min; Lee, Shim Sung (Inorganic Chemistry Communications, 2006)